Looking for a Leslie rotating speaker in a stompbox? The Boss RT-20 Rotary Speaker Sound Processor creates a new standard for rotary speaker emulations.

Guitarists from Santana to the Beatles have used a rotary speaker on stage and in the studio. BOSS kept this in mind when creating the Twin Pedal series RT-20 Rotary Sound Processor series, and by employing the Boss COSM modelling technology, the Boss RT-20 reproduces classic rotary sounds just like the original models. With Adjustable Rise Time, Horn and Bass speed, Overdrive, the Boss RT-20 emulates more than the classic swirl, and can create unique overdrive and pulsating effects as well. Amazing sound plus a stunning graphical view of the virtual rotors in its display. The Boss RT-20 virtual rotor display shows the audio-rotation characteristics of the RT-20 in real time. The center of the display, illuminated in red light, represents the virtual horn. The outside ring, illuminated in blue, displays the rotation of the virtual bass speaker. The stunning visual display gives you the actual speed and rotation of the speaker and is very helpful.

The Boss RT-20 rotary speaker simulator features four equally awesome, fully adjustable modes of operation: 1 Leslie 122 with natural overdrive, 2. Leslie 122 with on-mic setting, giving a tremolo-like effect, 3. Leslie backed by a distorted 59' Marshall. 4. UNI-V, which is a very accurate model of a Univibe.

Both guitars and keyboards can be plugged into the Boss RT20 rotary speaker simulator with a Drive Type switch to optimize the effects for guitar or keyboard. Dual outputs mean you output surround-like sound and true stereo effects. Add color by adding an expression pedal, which lets you control parameters such as rotation speed seamlessly from slow to fast in real time. The BOSS RT-20's phone jack is handy for silent practice.

BOSS RT20 ROTARY SPEAKER PROCESSOR FEATURES

Authentic rotary speaker sounds via Boss COSM technology.
Slow/Fast transition time is adjustable from gradual to rapid change; optional expression pedal can control speed in real time.
Onboard overdrive guitar effects.
Adjustable mix balance between Treble Rotor and Bass Rotor.
4 types of sounds, from standard rotary speaker effects to rock-oriented tones, UNI-V, and more.
Guitar/Keyboard switch.
Dazzling virtual-rotor display.

Further information on the Boss RT-20 Rotary Speaker Simulator with Guitar Effects Pedal